RSJust before you put a new injector on it would be an idea to confirm that it isn't commanded to do that. An amp clamp will give you that in 2 minutes.

I had a Audi RS6 some years ago that would throw / spray petrol out of the exhaust (cats cold) about 2 metres, that was the ground side switched wire short to ground holding the injector open.

Low compression could just be bore wash but I see 2 cylinders low ??

Your primary is still looking messy. It just came to mind that BMW do fire the Coils 3-4 times with the piston on power stroke only at idle, have seen it myself. Think they call it Multi Strike ? Could be wrong.

Last edited by STC on Thu Sep 29, 2016 1:28 pm, edited 1 time in total.

Hellojust to say I am now finished with BMW. I am replacing the injector cyl.1, all COP and spark plugs. The engine works quite well but I noticed that the mixture is still rich in bank 1. STFT came down from -25 to -5 and here are stuck and lambda is to highly, that's why I gave the car owner to drive a few days.

I recorded waveforms of injector no.1, primary and secondary ... see that COP transferred from Multi spark system to the ordinary spark system ... why ... I don't know.Also injector waveform is not well known to me. The direct injection system has a strange injector waveform.Unfortunately, many waveforms from this car is confuse for me.